SG. X872b, U149b, CC 146UC. A fine UNMOUNTED MINT 6½p Greenish Blue, in a top marginal block of four, on UNCOATED PAPER. Printed by Harrisons in gravure, only from counter sheet cylinder 4. Unusual to have this error / variety in a (top marginal) block of four! Additionally, comes with a 1983 RPS certificate. (JMD RS4st)

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